/* ==========  reset css  ========== */
* {
    margin:0;
    padding: 0;
}

body {
    font-size: 14px;
    font-family: "Microsoft YaHei",sans-serif;
    color: #333;
}

ul {
    list-style: none;
}

a {
    color: #333;
    text-decoration: none;
}

/* ==========  model css  ========== */
.qq_nav {
    height: 150px;
    background: url("../images/nav_bg.png") repeat-x;
    position: absolute;
    left:0;
    top:0;
    width:100%;
}

.qq_nav .wrapper {
    height:75px;
    width:1080px;
    margin: 0 auto;
}

.qq_nav .wrapper .logo {
    height:75px;
    width:100px;
    background: url("../images/nav_brand.png") no-repeat center;
    float: left;  /* a是行内元素 所以要float才能显示 */
}

.qq_nav .wrapper .nav {
    float: left;
}

.qq_nav .wrapper .nav li {
    float: left;
    font-size:18px;
    line-height: 75px;
    margin-left: 20px;
}

.qq_nav .wrapper .nav li a {
    display: block;
    padding: 0 20px;
}

.qq_nav .wrapper .nav li a.active,
.qq_nav .wrapper .nav li a:hover {
    background: #12b7f5;
}

.qq_nav .wrapper .register {
    float: right;
    height:36px;
    width:96px;
    text-align: center;
    line-height: 36px;
    font-size: 16px;
    background: #12b7f5;
    color: #fff;
    border-radius: 18px;
    margin-top: 19px;
}

.qq_nav .wrapper .other {
    float: right;
    width:250px;
    height:75px;
}

.qq_nav .wrapper .other ul {
    width:250px;
}

.qq_nav .wrapper .other ul li {
    float: right;
    margin-left: 40px;
}

.qq_nav .wrapper .other ul li a {
    font-size:14px;
    text-shadow: 0 0 2px #333;
    height:50px;
    line-height: 50px;
}

.qq_nav .wrapper .other span {
    float: right;
}

.qq_banner {
    height:880px;
    background: url("../images/banner-bg.jpg") no-repeat center top;
    padding-top: 150px;
}

.qq_banner img {
    display: block;
    margin: 20px auto 0;
}

.qq_banner img:last-child {
    width:100%;
    /* 自适应  等比例缩放 图片有这个特殊的效果 */
}

.qq_sound {}

.qq_sound h1 {
    height:300px;
    background: url("../images/sound-text.png") no-repeat center / cover;
    font-size: 0;
}

.qq_sound .bg {
    height: 500px;
    background: url("../images/sound-bg.jpg") no-repeat center / cover;
}

.qq_sound .content {
    height:500px;
    width:980px;
    margin: 0 auto;
    position: relative;
}

.qq_sound .content .iphone {
    position: absolute;
    left: 0;
    top:-200px;
    width:700px;
    height:700px;
    background: url("../images/sound-phone.png") no-repeat center top / cover;
}

.qq_sound .content h2 {
    float: right;
    padding-top: 100px;
    width:500px;
    text-align: right;
    font-size: 40px;
}

.qq_sound .content p {
    padding-top: 50px;
    float: right;
    width:500px;
    text-align: right;
    font-size:18px;
    text-shadow: 0 0 2px #333;
}

.qq_file {}

.qq_file .bg {
    height:500px;
    background: url("../images/file-bg.jpg") no-repeat center / cover;
}

.qq_file .content {
    height:500px;
    width:980px;
    margin:0 auto;
    position: relative;
}

.qq_file .content .mac {
    height:340px;
    width: 600px;
    background: url("../images/file-mac.png") no-repeat center / cover;
    position: absolute;
    right:-60px;
    top:100px;
}

.qq_file .content h2 {
    float: left;
    padding-top: 100px;
    width:500px;
    text-align: left;
    font-size:40px;
}

.qq_file .content p {
    padding-top: 50px;
    float: left;
    width:500px;
    text-align: left;
    font-size: 18px;
    text-shadow: 0 0 2px #333;;
}

.qq_interest {}

.qq_interest .bg {
    height: 500px;
    background: url("../images/interest-bg.jpg") no-repeat center / cover;
}

.qq_interest .content {
    height:500px;
    width:980px;
    margin: 0 auto;
    position: relative;
}

.qq_interest .content .phone {
    position: absolute;
    left: 0;
    top:0;
    width:350px;
    height:500px;
    background: url("../images/interest-phone.png") no-repeat center top / cover;
}

.qq_interest .content h2 {
    float: right;
    padding-top: 100px;
    width:500px;
    text-align: right;
    font-size: 40px;
}

.qq_interest .content p {
    padding-top: 50px;
    float: right;
    width:500px;
    text-align: right;
    font-size:18px;
    text-shadow: 0 0 2px #333;
}


.qq_footer {
    height:250px;
    background: #2a2a2a;
    font-size: 12px;
    text-align: center;
    padding-top:50px;
    color: #666;
}

.plats {
    width:800px;
    height:150px;
    margin:0 auto;
    display: block;
}

.plats a {
    float: left;
    background: transparent url("../images/footer.png") no-repeat 10px 0;
    text-align: center;
    font-size: 12px;
    color: #666;
    padding-top:50px;
    width:80px;
    margin:0 60px;
}
.plats a:hover {
    color: #12b7f5;
}

.plats a.plmb {
    background-position: 0 0;;
}

.plats a.plmb:hover {
    background-position: 0 -93px;
}

.plats a.plpc {
    background-position: -105px 0;
}

.plats a.plpc:hover {
    background-position: -105px -93px;
}

.plats a.plmac {
    background-position: -210px 0;
}

.plats a.plmac:hover {
    background-position: -210px -93px;
}

.plats a.plpad {
    background-position: -326px 0;
}

.plats a.plpad:hover {
    background-position: -326px -93px;
}

/* 加上视差效果 */
.qq_sound .bg,
.qq_file .bg,
.qq_interest .bg {
     background-attachment: fixed;
}










